[1000mp] MK 5 Driving Amp - a twist?

[Rob Murray]

I have been following the exciter/amp interface thread with great interest,
and have learned a lot from it, thank you all. I have a Mk 5 driving an old
Dentron MLA-2500 full power amp, and on reading much earlier in this forum
that the Mk5 internal tuner did not add much to the process, discontinued
using that tuner. 

This leaves me with pretty much a permanent SWR at the Mk 5 of about 1.8,
independent of band choice; I haven't worried about it much, but have
thought it would be nice to get it lower. While the thought of the 20.5 ft
coax matching section is most interesting, I had been thinking of simply
winding a toroidal impedance matching transformer (say N1/N2 = 1.4:1) and
placing it somewhere in the input line of the amp (on the amp input side
after the bypass relay). This thinking based on the thought (guess?) that
the amp input impedance is pretty well set by the 100 ohm input swamping
resistor, slightly reduced by the tube input, ie., about 90 ohms resistive
(generally), consistent with the Dentron specs in the manual.

Since none of the discussion has considered such a solution, I must be
missing an important point (or two or more...)

What am I missing?

73

Robert Murray    VA7RMM
RR1 S5 C16
Edgewood, BC    V0G 1J0
Phone/Fax (250) 269-7698